Brake drum



Sept. 6, 1932. c. w. SINCLAIR BRAKE DRUM Filed Jan. 8, 1932 ////////////////////VVW INVENTOR Char as I S z`7?c2a ir ATTORNEYS Patented Spt. e, 1932 UNITED STATES CHARLES W. SIN CLAIR, OF DETIROIT, MICHIGAN, ASSIGNOR TO KELSEY-HAYES WHEIEL CORPORATION, OF DETROIT, MICHIGAN, .A CORPORATION OF NEW YORK PATENT OFFICE BBAKE DRUM Application filed January 8, 1982. Serial No. 585.567.

The invention relates to brake drums and more particularly to brake drums for use with motor vehicles. One of the objects of the invention is to provide. an improved construction of brake drum having a body and a separately for-med transversely split brake engaging member so arranged that the body and the member are efiectively Secured together and the ends of the member are ei'ectively held in registration. Another ob ect is to s'o construct the brake engaging member or lining that the forming of its ends is facilitated.

These and other object-s of the invention will become apparent from the following description, taken in connection with the accompanying drawing, in which Figure 1 is a sectional elevation of a brake drum embodying my invention;

Figures 2, 3 and 4 are cross sections on the lines 2 2, 3-3 and 4-4, respectively, of Figure 1;

F igure 4 is a modification of Figure 4;

Figures 5, 6 and 7 are views similar .to Figures 2, 3 and 4, respeotively, showing another modification;

Figure 8 isa View similar to Figure 1 showing another embodiinent of my invention;

Figures 9, 10 and 11 are cross sections on the lines 9-9, 10-10 and 11-11, respectively, of Figure 8;

F igure 11 is a modification of Figure 11;

Figures 12, 13 and 14 are views similar to Figures 9, 10 and 11, respectively, showing another modification;

F igure 14' is a modification of Figure 14.

The brake drum, as" shown in Figure 1, comprises the body 1 and the brake engaging member 2. The body 1 is preferably a pressed or drawn sheet metal cup-shaped drum member having the back or web 3 and the integral transverse annul r flange 4. The' brake engaging member 2 is n the nature of an annular lining which extends within the annularflange 4 and preferably has the radially inner cylindrical surface 5 for engagement with the friction members, such as brake shoesfof the braking mechanism. This lining has portions in its width of different thickness and, as shown, is symmetrically arranged with respect to its median plane, it having at its middle the encircling or annular circumferentially extending rib 6 integral therewith. This rib increases the rigidity of the lining and also increases its heat conducting properties, the annular flange 4 having a contour to fit the radially r outer surface of the lining.

The lining is formed. of material having suitable wearing qualties, such as cast iron, high carbon steel, alloy steel or the like, and it is transversely-split at one point only, as designated at 7. To assemble the lining with the brake drum body, the lining is collapsed by overlapping its ends and the annular flange is ex anded by heating the same. At this time tlie lining is inserted within the annular flange and its ends brought into registration with the lining in position such that its radially outer surface properly registers with the corresponding radially inner surface of the annular flange. The annular flange is then allowed to cool or is cooled, so that it will shrink upon the lining, the relative dimensions being such that it forces the ends of the lining into tight engagement and holds the lining under compression. The step of collapsing the lining is necessary in th'e event that its encircling rib is of greater height than the expansion of the annular flange. However, in the event that the encircling rib is of less height than the amount of expansion that can be Secured the collapsing of the lining is not necessary.

For ,the purpose of holding the ends of the lining in registration both axially and radially of the lining, its ends are made to interlock both axially and radially. As shown, the ends at the opposite sides of the transverse split 7 are V-shaped with one nesting .within the other, so that they presentportions which overlap circumferentially of the-lining and hold the linin ends in axial registration. The lining en s also ,same contour. These zones have faces of the same extent throughout the width ot the lining and arranged at a predetermined angle to a radius of the hrahe drum passing therethrough. Furtherinore, the lining euds and 'more particularly the thicker portions of the lining ends including those portions formed by the encircling ribs 6 present other complemental zones 9 each of a contour ditferent from the zones 8 and more particularly having faces at a predetermined angle to a radius of the breke drum passing therethrough other than that of the faces of the zones 8. These faces specifically converge toward the faces of the zones 8 so that when the ends of the lining are together it will be seen that they are radially nterlocked and cannot separate from each other in a radial direction.,

The modification shown in Figure 4 differs from that shown in Figure %l in that the zones 10 have, instead of a continuous face,

a face with portions extending at angles to each other.

The modification shown in Figures 5, 6 j

and 7 difiers essentially from that shown in. Figures '2, 3 and lin that the angle of inclination ot the faces of the zones 11 whichextend 'throughout the width of the lining is less than that ot the faces formed by the zones 8, but these faces are continued in the other zones 12 of the ends of the lining to a oint suhstantially midway between the mazmurn distances between the radially inner and outer surfaces, after which the zones 12 have diverging faces.

In the modification shown in lFigure 8 the ends of the lining have portions which circumferentially overlap, but the transverse split 13 is arcuate and, as a result, these ends are arcuate instead of heing V-shaped, i

Referrin to Figures 9, 10 and ll, it is to he noted t at the complenental zones M which extend throughout the width of the lining are arcuate and have a center suhstantially midway of the portions ot the lining having a minimum thickness, as shown particularly in Figure 9. The other complemental zones 15 which are tormed hy the portions of great/er thickness also have the same radius of curvature.

Figure ll discloses a modification of Figure ll in which the zones 16 which are tormed hy the portionsot the lining of greater thich 4 ness are reversely curved. i

Figures ,12, 13 and lt disclose a modification in which the complemental zones l'' which extend throughout the width ot the lining each have converging faces and the With the above construction of the ends of nevaee the lining, it will he seen that by providing zones which extend throughout the width of the lining and each of which has substantially the same contour machining of the faces of these zones is' facilitated. It will also he seen that the zones formed by the portions of greater thickness of the lining may also he readily machined, sothat each will have substant ally the same contour, but thatthis contour may be readily made to be different from that of. the first mentioned zones. In all cases, the ends of the linin which nest with each other n radially overlapping relation, so that a radial interlockin of the ends is provided." Furthermore, in al cases the ends of the lining have portions which Iet with each other in cii'cumferentially overlapping relation, so that axial interlocking' is provded. i

What I claim as my invention is:

1. In a brake drum, a transversely split an ular lining having radially interlockmg en s.

2. In a brake drum, a transversely split annular lining having axially and radially interlockin cnds.

3 In a rake drum, a transversely split annular lining having portions ot different thickness and radially interlockin ends with the ends throughout the width o the lining presenting zones each of suhstantially the same contour.

have portions tin a breke drum, a transversely split annular lining having portions ot difierent thiclness and radially interlocking ends with the ends throughout the width of the lining presenting zones each of suhstantially the same contour and with the ends of the thicker portion also presentng other zones each of a contour difierent from said first mentioned zones.

5. In a hrake drum, a transversely split annular lining having portions of difierent' thichess and radially interlocking endswith the ends throughout the width ofthe lining presenting zones having faces at an angle to a radiusot the lorake drum passing therethrough.

6. In a hrake drum, a transversely split annular lining having portions of-difierent thiclmess and radially inter-looking ends with the ends throughout the width of the lining presenting zones having faces at an angle to a radius of the hrake drum passing therethrough and with the ends of the thicher portion also presenting zones having faces at another angle than said first mentioned faces.

7. lln a brake drum, a transversely split annular lining having portions of different thickness and radially interlocking ends with the ends throughout the width of the lining presenting zones each of suhstantially the' same rounded contour and with the ende of the thiclrer portion also presenting other zones each of a rounded contour difl'erent from said first mentioned zones.

8. In a brake drum, a transversely split annular lining having ends with ortions overlapping peripherally of the linng and with portions overlappng radially of the lining.

9. In a brake drum, a transversely split annular lining having radially interlockng ends and a body having a portion encircling a portion of said lining and holding the same under compression.

In testimony whereof I afl'x my signature.

CHARLES W. SINCLAIR. 

